博 museum　/extensive

They oughta take that crazy rainbow phlegm you HACK up and put it in a museum, you cancerous chain-smoking freak!!

This museum has an extensive collection, with over ten specialized exhibits.

museum ★★★☆☆
博 (museum　/extensive) + 物 (animal / thing) + 館 (big hall) = 博物館 (museum)

a natural history museum or aerospace museum. (fine-art museums are 美術館　（びじゅつかん））

exposition ★☆☆☆☆
博 (museum　/extensive) + 覧 (view) + 会 (big meeting) = 博覧会 (exposition)

a GIANT exposition. Not like, "Cezanne's greatest fuckin' paintings all up in here festival" but huger - like a World's Fair.

To break it down:

博覧会 (biggest　kind of expo )

　展示会（てんじかい＝trade show)

展覧会 （てんらんかい＝art exhibition)