slime mold vs slime mould

slime mold and slime mould both are nouns.

Word	Noun	Adjective	Verb	Adverb
slime mold	Yes	No	No	No
slime mould	Yes	No	No	No

As nouns, slime mold and slime mould are synonyms defined as:

slime mold and slime mould: a naked mass of protoplasm having characteristics of both plants and animals; sometimes classified as protoctists

slime mold (noun)	slime mould (noun)
a naked mass of protoplasm having characteristics of both plants and animals; sometimes classified as protoctists	a naked mass of protoplasm having characteristics of both plants and animals; sometimes classified as protoctists