fitter — the manner in which a thing fits: The fit was perfect.
fritter — to squander or disperse piecemeal; waste little by little (usually followed by away): to fritter away one's money; to fritter away an afternoon.
glitter — to reflect light with a brilliant, sparkling luster; sparkle with reflected light.
gritter — abrasive particles or granules, as of sand or other small, coarse impurities found in the air, food, water, etc.
hitter — to deal a blow or stroke to: Hit the nail with the hammer.
knitter — to make (a garment, fabric, etc.) by interlocking loops of one or more yarns either by hand with knitting needles or by machine.
litter — objects strewn or scattered about; scattered rubbish.
quitter — a person who quits or gives up easily, especially in the face of some difficulty, danger, etc.
heavy hitter — a baseball player who makes many extra-base hits.
spark transmitter — a transmitting set that generates electromagnetic waves by the oscillatory discharge from a capacitor through an inductor and a spark gap.
Four-or-more syllable rhymes
designated hitter — In baseball, a designated hitter is a player who bats in place of the pitcher.