civet vs civet cat

civet and civet cat both are nouns.

Word	Noun	Adjective	Verb	Adverb
civet	Yes	No	No	No
civet cat	Yes	No	No	No

As nouns, civet and civet cat are synonyms defined as:

civet and civet cat: cat-like mammal typically secreting musk used in perfumes

civet (noun)	civet cat (noun)
cat-like mammal typically secreting musk used in perfumes	cat-like mammal typically secreting musk used in perfumes
	raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings