bar graph vs bar chart

bar graph and bar chart both are nouns.

Word	Noun	Adjective	Verb	Adverb
bar graph	Yes	No	No	No
bar chart	Yes	No	No	No

As nouns, bar graph and bar chart are synonyms defined as:

bar graph and bar chart: a chart with bars whose lengths are proportional to quantities

bar graph (noun)	bar chart (noun)
a chart with bars whose lengths are proportional to quantities	a chart with bars whose lengths are proportional to quantities