1. The easiest compound adjectives to spot are the ones which include numbers.
Examples:
Two-seater aircraft

4-bedroom house


"24-hour" (This is correct.)
(newspaper article)
"3-day" (This is correct)
(newspaper article)
Three stone weakling
(should be "Three-stone")
15-page document
2. Not all compound adjectives include numbers. Often, a compound adjective comprises words that would not normally be joined together with a hyphen.
Examples:
The double glazing is leaking. Can you call that double-glazing salesman?
("double-glazing" describes "salesman")
You call this silver service? She's not a trained silver-service waitress.

("silver-service" describes "waitress")

should be "8-week money-back guarantee
(newspaper advertisement)
"Cambridge-based" and
"high-speed" (both correct)
(magazine article)
Carl is far too chatty. Philip is another far-too-chatty individual.

("far-too-chatty" describes "individual")
It's true! The board outside the cafe read, "All-day breakfast 0830-1030."

("All-day" describes breakfast)
That was a never-to-be-forgotten experience.
James is a second rate plumber.
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ADJECTIVE?
An adjective is a describing word (e.g. "red","big", "beautiful", "contagious"). (See lesson "Adjectives".)
COMPOUND ADJECTIVE?
A single adjective made up of two or more words is called a "compound adjective". The words in a compound adjective are linked together by a hyphen (or hyphens) to show that they are part of the same adjective.
three-page document (< "three-page" is a compound adjective)
ironing-board cover (< "ironing-board" is a compound adjective)
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MORE THAN ONE ADJECTIVE OR A COMPOUND ADJECTIVE?
Do not be tempted to string all adjectives together with hyphens. It is common to use more than one adjective to describe something. When you use 2 or more adjectives to describe one thing, it is called "enumeration of adjectives". (This is covered in more detail in the lesson "Commas".)
A big maroon car
(2 adjectives: "big" and "maroon")
She is an intelligent articulate lady.
(2 adjectives: "intelligent" and "articulate")
ADVERBS WITH ADJECTIVES
Adjectives are often preceded by adverbs like "very", "well", "beautifully", "extremely", etc. (See lesson "Adverbs".)
Usually, there is no need to link an adverb to an adjective using a hyphen.
Example:
Young Paula is a very talented
student. 
(As "very" is an adverb, it should not be linked to the adjective "talented" with a hyphen.)
Linking an adverb like "very", "most" or "least" to an adjective with a hyphen is an uncommon error. However, when an adverb ends in "ly" (and lots do), some writers feel the urge to link it to the adjective with a hyphen - there is no need.
It was a wonderfully-decorated
tree.
(The adverb "wonderfully" modifies the adjective "decorated", but there is no need to join the two with a hyphen.)
However, with words like "well", "fast" and "best" (which are both adjectives and adverbs), a hyphen can be used to avoid ambiguity.
Alan is the best-known player on the pitch.
(In this example, Alan is known better than any other player.)
Alan is the best known player on the pitch.
(In this example, Alan could be the best player of all the known players on the pitch.)
(This is covered in the lesson "Adjectives" and the lesson "Adverbs".)
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HOW TO SPOT A COMPOUND ADJECTIVE
Put "and" between the adjectives. If there is no loss of meaning, then you are very likely to be dealing with several adjectives, as opposed to a compound adjective.
step 1 large proud rooster
step 2 large and proud rooster
Although different in style, there is no loss of meaning. This is an example of two adjectives; no hyphen required.
step 1 free range rooster
step 2 free and range rooster
In this example, there is a change in meaning. The rooster is not "free" and what is a "range rooster"? This is a compound adjective and should be written as "free-range rooster".
step 1 first aid post
step 2 first and aid post
Although "aid post" is okay, there is a change in meaning with "first post". This should be written as "first-aid post"
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