fine-toothed comb vs fine-tooth comb

fine-toothed comb and fine-tooth comb both are nouns.

Word	Noun	Adjective	Verb	Adverb
fine-toothed comb	Yes	No	No	No
fine-tooth comb	Yes	No	No	No

As nouns, fine-toothed comb and fine-tooth comb are synonyms defined as:

fine-toothed comb and fine-tooth comb: a method of examining in minute detail

As nouns, fine-toothed comb and fine-tooth comb are synonyms defined as:

fine-toothed comb and fine-tooth comb: a comb with teeth set close together

fine-toothed comb (noun)	fine-tooth comb (noun)
a method of examining in minute detail	a method of examining in minute detail
a comb with teeth set close together	a comb with teeth set close together