crawl vs crawler

crawl and crawler both are nouns.

Word	Noun	Adjective	Verb	Adverb
crawl	Yes	No	Yes	No
crawler	Yes	No	No	No

crawl (noun)	crawler (noun)
a slow mode of locomotion on hands and knees or dragging the body	terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers
a swimming stroke; arms are moved alternately overhead accompanied by a flutter kick	a person who tries to please someone in order to gain a personal advantage
a very slow movement	a person who crawls or creeps along the ground

crawl (verb)	crawler (verb)
move slowly; in the case of people or animals with the body near the ground
swim by doing the crawl
show submission or fear
be full of
feel as if crawling with insects