Synonyms of only

1 Syllable
sole, lone, shag, swank
2 Syllables
onliest, peerless, hardly, matchless, apart, scantly, solo, swanking, shagger, champer, single, one, singler, soler, oner
3 Syllables
alltime, alone, purely, unique, diacritic, merely, singled-out, unshared
4 Syllables
hermitical, unapproached, unequaled, unrivaled, individual, exclusory, exclusive, unitary, detectably, solitary, particular, isolated, entirely
5 Syllables
unparalleled, unparagoned, exclusionary, unaccompanied, unrepeatable, solitarily, exclusively