wildcat vs attacker

wildcat and attacker both are nouns.

Word	Noun	Adjective	Verb	Adverb
wildcat	Yes	Yes	No	No
attacker	Yes	No	No	No

As nouns, attacker is a hypernym of wildcat; that is, attacker is a word with a broader meaning than wildcat:

Other hypernyms of wildcat include aggressor, assailant, assaulter.

wildcat (noun)	attacker (noun)
any small or medium-sized cat resembling the domestic cat and living in the wild	someone who attacks
an exploratory oil well drilled in land not known to be an oil field
a cruelly rapacious person

wildcat (adjective)	attacker (adjective)
(of a mine or oil well) drilled speculatively in an area not known to be productive
without official authorization
outside the bounds of legitimate or ethical business practices