Synonyms for Only:

adj.

all (adjective)
alone.
matchless (adjective)
incomparable, matchless, nonpareil.
peerless (adjective)
unexampled.
single (adjective)
individual, lone, odd, single, singular, sole, solitary, unique.
singular (adjective)
alone, exclusive, individual, isolated, lone, matchless, one, particular, peerless, single, sole, solitary, unequaled, unique, unparalleled, unrivaled.

adv.

barely; exclusively (adverb)
but, entirely, just, merely, simply, solely, utterly, nothing but.
separately (adverb)
individually, severally.

adv

completely (adverb)
entirely.
merely (adverb)
just, simply.

n.

anyhow, anyway, by the way, even so, furthermore, in any case, incidentally, namely, not to mention, the fact that. before, here, include, last, one, particular, separate, sometime, then, when, This, Until, Whenever. beyond, incomparable, matchless, nonpareil, peerless, same, unequaled, unexampled, unmatched, unparalleled, unrivaled, Excepting, Excluding, with the exception of, exclusive of something, otherwise than. few, little, mere, minimum, scant, slight, sparse. merely (noun)
just, simply, solely.
only (noun)
alone, but, entirely, exclusive, exclusively, just, lone, lonesome, merely, only if, only when, simply, single, sole, solely, solitary.
sole (noun)
isolated, unclassified, Companionless.
solely (noun)
individually, severally, singly, utterly, nothing but.

Other synonyms:

few, mere, minimum, scant, sparse, unmatched, Excepting, Excluding, nothing but. incomparable, little, matchless, nonpareil, one, unequaled, unexampled, unparalleled. peerless, unrivaled. particular. beyond. alone
alone, singly.
Other relevant words:
alone, beyond, but, entirely, exclusive, exclusively, few, incomparable, isolated, just, little, lonesome, matchless, mere, merely, nonpareil, one, only if, only when, particular, peerless, same, scant, separate, simply, singly, solely, unequaled, unexampled, unmatched, unparalleled, unrivaled, Excepting, Excluding, Companionless, nothing but.

Usage examples for only

  1. No, not that- only to ask you to understand. – Gunman's Reckoning by Max Brand
  2. But you're only one man. – The Port of Adventure by Charles Norris Williamson and Alice Muriel Williamson
  3. But she only said, " Then, dear, tell him so." – Patty Blossom by Carolyn Wells