punctuation vs punctuate

punctuation is a noun but punctuate is not a noun.

Word	Noun	Adjective	Verb	Adverb
punctuation	Yes	No	No	No
punctuate	No	No	Yes	No

punctuation (noun)	punctuate (noun)
the use of certain marks to clarify meaning of written material by grouping words grammatically into sentences and clauses and phrases
the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases
something that makes repeated and regular interruptions or divisions

punctuation (verb)	punctuate (verb)
	insert punctuation marks into
	interrupt periodically
	to stress, single out as important