ratch vs ratchet

ratch and ratchet both are nouns.

Word	Noun	Adjective	Verb	Adverb
ratch	Yes	No	No	No
ratchet	Yes	No	Yes	No

As nouns, ratch and ratchet are synonyms defined as:

ratch and ratchet: mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction

Other synonyms of ratch include rachet.

ratch (noun)	ratchet (noun)
mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction	mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction

ratch (verb)	ratchet (verb)
	move by degrees in one direction only