rhombus vs rhomb

rhombus and rhomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhombus	Yes	No	No	No
rhomb	Yes	No	No	No

As nouns, rhombus and rhomb are synonyms defined as:

rhombus and rhomb: a parallelogram with four equal sides; an oblique-angled equilateral parallelogram

Other synonyms of rhombus include diamond.

rhombus (noun)	rhomb (noun)
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram	a parallelogram with four equal sides; an oblique-angled equilateral parallelogram