kiss vs peck

kiss and peck both are nouns.

Word	Noun	Adjective	Verb	Adverb
kiss	Yes	No	Yes	No
peck	Yes	No	Yes	No

As nouns, peck is a hyponym of kiss; that is, peck is a word with a more specific, narrower meaning than kiss:

Other hyponyms of kiss include smack, smooch, deep kiss, French kiss, soul kiss.

As verbs, peck is a hyponym of kiss; that is, peck is a word with a more specific, narrower meaning than kiss:

kiss: touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.
peck: kiss lightly

Other hyponyms of kiss include smack.

kiss (noun)	peck (noun)
the act of caressing with the lips (or an instance thereof)	a light kiss
a light glancing touch	bite by a bird
any of several bite-sized candies	(often followed by `of') a large number or amount or extent
a cookie made of egg whites and sugar	a United States dry measure equal to 8 quarts or 537.605 cubic inches
	a British imperial capacity measure (liquid or dry) equal to 2 gallons

kiss (verb)	peck (verb)
touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.	bother persistently with trivial complaints
touch lightly or gently	eat by pecking at, like a bird
	eat like a bird
	kiss lightly
	hit lightly with a picking motion