1 syllable:
bish, dish, fish, gish, ish, kish, knish, rish, squish, swish, tisch, whish, wish

2 syllables:
alms dish, batfish, billfish, blackfish, blindfish, bluefish, boarfish, bonefish, boxfish, burrfish, catfish, chenfish, clingfish, coalfish, codfish, cold fish, conchfish, crampfish, crawfish, dealfish, dogfish, driftfish, drumfish, fallfish, filefish, finfish, flamefish, flatfish, flyfish, food fish, fresh fish, frogfish, frost fish, game fish, garfish, ghostfish, globefish, goatfish, goldfish, goosefish, go fish, groundfish, headfish, hogfish, horsefish, jawfish, jewfish, kingfish, latish, lumpfish, lungfish, monkfish, moonfish, mudfish, net fish, numbfish, oarfish, odd fish, offish, oilfish, pearlfish, pigfish, pipefish, poor fish, porkfish, queenfish, ratfish, redfish, rockfish, rosefish, rough fish, sailfish, sandfish, sawfish, sheatfish, shellfish, shrimpfish, side dish, snailfish, snakefish, snipefish, soapfish, soap dish, spadefish, spearfish, starfish, still-fish, stockfish, stonefish, sunfish, surffish, surf fish, swellfish, swordfish, threadfish, tilefish, toadfish, tonguefish, trunkfish, unwish, weakfish, whitefish, wolffish, wolfish, wolf fish, wormfish, wreckfish, young fish

3 syllables:
amberfish, angelfish, anglerfish, angler fish, archerfish, balloonfish, barrelfish, basket fish, bellows fish, blue catfish, bony fish, bottom fish, butterfish, butter dish, candlefish, chafing dish, cigarfish, convictfish, cornetfish, creole-fish, cutlassfish, cuttlefish, damselfish, dandyish, devilfish, doctorfish, dollarfish, dolphinfish, dwarf pipefish, flashlight fish, flying fish, guitarfish, handsaw fish, harvestfish, jackknife-fish, jellyfish, ladyfish, lake whitefish, lancetfish, lancet fish, lanternfish, leatherfish, lionfish, lizardfish, muttonfish, needlefish, overfish, oysterfish, oyster fish, paddlefish, parrotfish, petri dish, pilotfish, pollyfish, rabbitfish, rainbow fish, razorfish, ribbonfish, rock sunfish, round whitefish, rudderfish, sea catfish, sea crawfish, sergeant fish, serving dish, silverfish, skilletfish, smooth dogfish, soldierfish, squirrelfish, standoffish, suckerfish, sucking fish, surgeonfish, tokenish, triggerfish, trumpetfish, tuna fish, yokelish

4 syllables:
anemone fish, armored catfish, buffalofish, buffalo fish, butterflyfish, butterfly fish, cardinalfish, channel catfish, crucifix fish, flathead catfish, freshwater fish, kettle of fish, mosquitofish, ocean sunfish, porcupinefish, porcupine fish, saltwater fish, scorpionfish, scorpion fish, spiny dogfish, spotted sunfish

5 syllables:
alligatorfish, atlantic sailfish, biplane flying fish, blue channel catfish, clown anemone fish, deepwater pipefish, electric catfish

6 syllables:
european catfish, european flatfish, monoplane flying fish, rocky mountain whitefish

7 syllables:
american smooth dogfish, atlantic spiny dogfish, pacific spiny dogfish

2 syllables:
blowfish, cowfish