dishonorably vs dishonourably

dishonorably and dishonourably both are adverbs.

Word	Noun	Adjective	Verb	Adverb
dishonorably	No	No	No	Yes
dishonourably	No	No	No	Yes

As adverbs, dishonorably and dishonourably are synonyms defined as:

dishonorably and dishonourably: in a dishonorable manner or to a dishonorable degree

Other synonyms of dishonorably include discreditably, disgracefully, ignominiously, ingloriously, shamefully.

dishonorably (adverb)	dishonourably (adverb)
in a dishonorable manner or to a dishonorable degree	in a dishonorable manner or to a dishonorable degree
with dishonor
in a dishonorable manner