bell glass vs bell jar

bell glass and bell jar both are nouns.

Word	Noun	Adjective	Verb	Adverb
bell glass	Yes	No	No	No
bell jar	Yes	No	No	No

As nouns, bell glass and bell jar are synonyms defined as:

bell glass and bell jar: a bell-shaped glass cover used to protect and display delicate objects or to cover scientific apparatus or to contain gases

bell glass (noun)	bell jar (noun)
a bell-shaped glass cover used to protect and display delicate objects or to cover scientific apparatus or to contain gases	a bell-shaped glass cover used to protect and display delicate objects or to cover scientific apparatus or to contain gases