Non-rhyming English words of two syllables or fewer
almond (Though 'diamond' forms a Masculine rhyme with it)
angry
angst
aspirin
bachelor
breadth
bulb—although the OED lists culb, a retort
chaos
chimney
circus
citrus
crayon
depth
different (whether pronounced as two- or three-syllable word)
dunce (close rhyme with "runts")
elbow
else
empty
engine
film
glimpsed
gulf (although in some dialects this is pronounced to rhyme with 'wolf')
(gulf rhymes with engulf, as in: "The fire engulfed the room")
golf
hostage
iron
javelin
justice (only rhymes with proper nouns)
laundry
luggage
monster
month—disputed; some claim that oneth is a word, by analogy with second, third, while others note that the logical analogy is with "twoth" and "threeth". The mathematical expression "n+1th" is one place where this rhyme can be used. Also, millionth, billionth etc. The word Grunth, (alternative spelling to Granth) the name of the sacred scripture of the Sikhs, also rhymes.
mulcts
ninth
office
olive
orange
pint (rhymes with obscure northern dialect word rynt, which means 'to stand aside')
pedant
penguin
pizza
promise (only rhymes with proper nouns)
reptile
rhythm
shadow
sculpts
silver
sixth
transfer
twelfth Can be loosely rhymed with stealth
vacuum
width
wolf