in particular vs particularly

in particular and particularly both are adverbs.

Word	Noun	Adjective	Verb	Adverb
in particular	No	No	No	Yes
particularly	No	No	No	Yes

As adverbs, in particular and particularly are synonyms defined as:

in particular and particularly: specifically or especially distinguished from others

in particular (adverb)	particularly (adverb)
specifically or especially distinguished from others	to a distinctly greater extent or degree than is common
	uniquely or characteristically
	specifically or especially distinguished from others