stud vs stallion

stud and stallion both are nouns.

Word	Noun	Adjective	Verb	Adverb
stud	Yes	No	Yes	No
stallion	Yes	No	No	No

As nouns, stallion is a hypernym of stud; that is, stallion is a word with a broader meaning than stud:

Other hypernyms of stud include entire.

stud (noun)	stallion (noun)
poker in which each player receives hole cards and the remainder are dealt face up; bets are placed after each card is dealt	uncastrated adult male horse
adult male horse kept for breeding
an upright in house framing
ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)
a man who is virile and sexually active

stud (verb)	stallion (verb)
provide with or construct with studs
scatter or intersperse like dots or studs