jerk vs jerker

jerk and jerker both are nouns.

Word	Noun	Adjective	Verb	Adverb
jerk	Yes	No	Yes	No
jerker	Yes	No	No	No

jerk (noun)	jerker (noun)
an abrupt spasmodic movement	someone who gives a strong sudden pull
a sudden abrupt pull
raising a weight from shoulder height to above the head by straightening the arms
meat (especially beef) cut in strips and dried in the sun
a dull stupid fatuous person
(mechanics) the rate of change of acceleration

jerk (verb)	jerker (verb)
make an uncontrolled, short, jerky motion
throw or toss with a quick motion
pull, or move with a sudden movement
move with abrupt, seemingly uncontrolled motions
jump vertically, with legs stiff and back arched