6 Answers

Lack, Sack, Smack, Crack, Knack, black, clack, plaque, stack, rack, mac ,snack, slack, fact,hack,shack, jack ,pack  ,,track, tack, wack, yak, black attack,

and thats just the ones that end with "ck" sounds

Here you go with some rhymes for "back":1 syllable:
ack, akc, backe, bak, bakke, black, brac, brack, brakke, braque, cac, caq, clack, claque, crack, dac, dack, dak, fac, flack, flak, hack, hacke, haq, haque, jac, jack, jacques, knack, krack, kracke, kwak, lac, lack, lak, mac, mack, macke, mak, nack, nacke, pac, pack, pak, paque, plack, placke, plaque, ptak, quack, rack, rak, sac, sack, sak, schack, schlack, schnack, schrack, shack, shaq, slack, smack, snack, spack, spak, stac, stack, strack, stracke, tac, tack, tacke, tak, thwack, trac, track, trak, wack, whack, whack, wrack, yack, yak, zach, zack, zak

2 syllables:
aback, adak, air sac, attack, beaulac, blue jack, bomb rack, cart track, chirac, coal black, dirt track, dish rack, dress rack, dulac, face pack, grass wrack, half track, ice pack, jet black, knick-knack, man jack, oblak, phone jack, pipe rack, pitch black, plate rack, repack, roof rack, sad sack, sand crack, screw jack, sea wrack, seed lac, shoe black, ski rack, soot black, spice rack, spore sac, spur track, stick lac, tabak, tear sac, tie rack, tie tack, toe crack, unpack, vanvlack, welsh black, wolf pack, yolk sac

3 syllables:
air attack, blister pack, bubble pack, bumper jack, carbon black, carpet tack, cinder track, data track, dental plaque, dressing sack, fatigue crack, fishing smack, freddie mac, garnet lac, ground attack, gunny sack, heart attack, hit the sack, inside track, jumping jack, luggage rack, music rack, platinum black, post-attack, power pack, quarter crack, railroad track, streetcar track, t a c, t a c, take aback, towel rack, union jack, whisker jack, yellow jack

4 syllables:
asthma attack, bicycle rack, ivory black, magazine rack, panic attack, plan of attack, serrated wrack, sonora lac, surprise attack, telephone jack, under attack

back  >  hack, jack, lack, pack,  rack, sack, tack, track, vac, whack, yak, slack, black, shack, stack, snack, smack, ac, knack, plaque, crack, flack, flak, quack, ....................I can't think no more. I'm tired!

Black cat.

Big Mac

Tack