1 syllable:
-phil, bcl-xl, bphil, bruhl, cfs pml, chol-, chole-, chtml, chul, cmd ctl, cnc msbl, crd ml, crile, crrel, crull, cul, cull, db spl, dhtml, dlbcl, dns bl, dphil, dpssl, dq pl, dsp ml, dull, dulle, dvb html, fc-al, fd fl, fd tle, fn fal, frz lvl, fs vdsl, ft-pdl, ftr dml, ft sill, ghyll, gt pml, gt sql, guhl, gul, gull, gzhel, hp-gl, hp gl, hp rtl, hrc stl, hull, hw swil, juhl, khtml, kpd ml, kpn ml, krul, krull, kuhl, kull, l-shell, lcd ltl, lc bpl, leful, lgsil, lh tl, lull, mmms ol, mmse ble, mphil, mp cdl, muhl, mull, ndebele, nk lgl, nnell, nswc dl, null, nulle, pg ml, phtml, prndl, puhl, pwyll, rc pl, rdd rel, rt cdl, ruhl, schmuhl, scull, sc cl, sf dl, shacl, shull, skrill, skrull, skule, skull, skulle, smull, sptzle, std msl, stp pul, strull, stuhl, stull, sul, szell, thell, thul, thull, tkp ml, tls ssl, tmp il, tmr tl, traill, trull, tull, uhl, ul, v-hull, v/stol, vdm sl, wf ml, will, wtfpl, www vl, xhtml, yul, zf ble, zn cl, zwolle, zxnrbl

2 syllables:
catulle, davul, earful, earfull, goksel, macul, maghull, mew gull, moonbyul, numbskull, numskull, quickhull, sapskull, sea-gull, seagull, sea gull, setule, thickskull, woodhull

3 syllables:
herring gull, laughing gull, multihull, overfull, solihull, sprachgefuhl, thomas tull, underpull

4 syllables:
ivory gull, mp3skull