search vs ransack

search is a noun but ransack is not a noun.

Word	Noun	Adjective	Verb	Adverb
search	Yes	No	Yes	No
ransack	No	No	Yes	No

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

Other hyponyms of search include raid, frisk, strip-search, scan, go, rifle, rummage, comb.

search (noun)	ransack (noun)
the activity of looking thoroughly in order to find something or someone
boarding and inspecting a ship on the high seas
an investigation seeking answers
the examination of alternative hypotheses
an operation that determines whether one or more of a set of items has a specified property

search (verb)	ransack (verb)
inquire into	search thoroughly
try to locate or discover, or try to establish the existence of	steal goods; take as spoils
subject to a search
search or seek