As nouns the difference between crums and crumbs
is that crums is while crumbs is .
As an interjection crumbs is
(chiefly|british) an expression of mild surprise.
crums
English
Noun
(head)
----
crumbs
English
Noun
(head)
Interjection
(
en interjection)
(chiefly, British) an expression of mild surprise