observe vs solemnise

observe and solemnise both are verbs.

Word	Noun	Adjective	Verb	Adverb
observe	No	No	Yes	No
solemnise	No	No	Yes	No

As verbs, solemnise is a hyponym of observe; that is, solemnise is a word with a more specific, narrower meaning than observe:

Other hyponyms of observe include commemorate, mark, mourn, solemnize.

observe (verb)	solemnise (verb)
stick to correctly or closely	make solemn and grave
make mention of	observe or perform with dignity or gravity
watch attentively	perform (the wedding ceremony) with proper ceremonies
observe with care or pay close attention to
discover or determine the existence, presence, or fact of by perception with the eyes
follow with the eyes or the mind
show respect towards
behave as expected during of holidays or rites
conform one's action or practice to