crenel vs crenellate

crenel is a noun but crenellate is not a noun.

Word	Noun	Adjective	Verb	Adverb
crenel	Yes	No	Yes	No
crenellate	No	No	Yes	No

As verbs, crenel and crenellate are synonyms defined as:

Other synonyms of crenel include crenelate.

crenel (noun)	crenellate (noun)
a notch or open space between two merlons in a crenelated battlement
one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)

crenel (verb)	crenellate (verb)
supply with battlements	supply with battlements