2 syllables:
attar, atter, at her, at tur, batter, blatter, catar, catarrh, chatter, chattr, clatter, datar, fatter, flatter, gatter, gratter, hatter, latar, latter, mater, matter, natter, patar, patter, phatter, platter, ratter, sater, sattar, satter, scatter, schlatter, shatter, slatter, smatter, spatter, splatter, tatar, tatter, that her, tratar, vatter, xatar, yatter, zatar

3 syllables:
aplatir, backscatter, back matter, beflatter, bescatter, bespatter, combater, combatir, combattre, end matter, formatter, front matter, gray matter, grey matter, hamfatter, impastor, mcfatter, mcphatter, no matter, outflatter, puff batter, standpatter, the matter, toscatter, vanatter, vannater, vannatter, waste matter, white matter, wildcatter

4 syllables:
antimatter, black lives matter, chitterchatter, fecal matter, fritter batter, loviatar, mongol tatar, overmatter, pancake batter, pitter-patter, spin the platter, state of matter, subject matter, troposcatter, turko-tatar, written matter

5 syllables:
crux of the matter, textual matter

6 syllables:
pictorial matter

7 syllables:
conservation of matter

9 syllables:
law of conservation of matter

2 syllables:
fodder, proper, choker, topper, shocker, stocker, cropper, laugher, dodder, cocker, logger, fakir, dropper, cobber, ocher, slobber, copper, whopper, locker, robber, rocker, stopper, hopper, blocker, slogger, docker, soccer, clobber, lager, knocker, jobber, jogger, bobber, shopper, solder, plodder, mocker, chopper, adder, backer, bader, bagger, bakker, blabber, bladder, clabber, clapper, cracker, crapper, dagger, dapper, faqir, flapper, grabber, hacker, jabber, jaeger, jagger, knacker, lacquer, ladder, madder, mapper, nagger, pabir, packer, rapper, sapper, satyr, scrapper, slabber, slacker, smacker, snapper, stabber, stagger, strapper, swagger, tracker, trapper, whacker, wrapper

3 syllables:
macabre, punk rocker, improper, air bladder, attacker, cat cracker, death adder, dust wrapper, fish ladder, gray snapper, hog snapper, jack ladder, line backer, milk adder, puff adder, red snapper, rope ladder, sea ladder, step ladder, swim bladder, thigh-slapper, white madder, wild madder

4 syllables:
blister copper, beta blocker, cannon fodder, banded adder, cannon cracker, checkered adder, cloak-and-dagger, double dagger, flaccid bladder, graham cracker, jacob's ladder, mangrove snapper, monkey ladder, mutton snapper, oyster cracker, pilot ladder, scaling ladder, soda cracker, spanish dagger, spirit rapper, whippersnapper

5 syllables:
aerial ladder, extension ladder, indian madder

6 syllables:
davy jones's locker, alligator snapper, catalytic cracker, northern jacob's ladder, urinary bladder

7 syllables:
accommodation ladder