temperamental vs erratic

temperamental and erratic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
temperamental	No	Yes	No	No
erratic	No	Yes	No	No

As adjectives, temperamental and erratic are synonyms defined as:

temperamental (adjective)	erratic (adjective)
relating to or caused by temperament	liable to sudden unpredictable change
subject to sharply varying moods	likely to perform unpredictably
likely to perform unpredictably	having no fixed course