microblog vs blog

microblog and blog both are nouns.

Word	Noun	Adjective	Verb	Adverb
microblog	Yes	No	No	No
blog	Yes	No	Yes	No

As nouns, blog is a hypernym of microblog; that is, blog is a word with a broader meaning than microblog:

microblog: a blog in which there is a limitation on the length of individual postings.
blog: a shared on-line journal where people can post diary entries about their personal experiences and hobbies

Other hypernyms of microblog include web log.

microblog (noun)	blog (noun)
a blog in which there is a limitation on the length of individual postings.	a shared on-line journal where people can post diary entries about their personal experiences and hobbies

microblog (verb)	blog (verb)
	read, write, or edit a shared on-line journal