suckle vs sexual activity

suckle is not a noun while sexual activity is a noun.

Word	Noun	Adjective	Verb	Adverb
suckle	No	No	Yes	No
sexual activity	Yes	No	No	No

suckle (noun)	sexual activity (noun)
	activities associated with sexual intercourse

suckle (verb)	sexual activity (verb)
give suck to
suck milk from the mother's breasts