speak vs memorialise

speak and memorialise both are verbs.

Word	Noun	Adjective	Verb	Adverb
speak	No	No	Yes	No
memorialise	No	No	Yes	No

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

Other hyponyms of speak include blaze away, memorialize, keynote, harangue.

speak (verb)	memorialise (verb)
express in speech	be or provide a memorial to a person or an event
exchange thoughts; talk with	address in a memorial
use language
give a speech to
make a characteristic or natural sound