ratchet vs ratchet down

ratchet is a noun but ratchet down is not a noun.

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

As verbs, ratchet and ratchet down are synonyms defined as:

Other synonyms of ratchet include rachet up.

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

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