civet cat vs bearcat

civet cat and bearcat both are nouns.

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

As nouns, bearcat is a hyponym of civet cat; that is, bearcat is a word with a more specific, narrower meaning than civet cat:

civet cat: cat-like mammal typically secreting musk used in perfumes
bearcat: arboreal civet of Asia having a long prehensile tail and shaggy black hair

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