osculation vs peck

osculation and peck both are nouns.

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

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

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

osculation (noun)	peck (noun)
the act of caressing with the lips (or an instance thereof)	a light kiss
(mathematics) a contact of two curves (or two surfaces) at which they have a common tangent	bite by a bird
	(often followed by `of') a large number or amount or extent
	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

osculation (verb)	peck (verb)
	bother persistently with trivial complaints
	eat by pecking at, like a bird
	eat like a bird
	kiss lightly
	hit lightly with a picking motion