Nouns

(n)overall(usually plural) work clothing consisting of denim trousers (usually with a bib and shoulder straps)
(n)overall, boilersuit, boilers suita loose protective coverall or smock worn over ordinary clothing for dirty work

Adjectives

(s)overallinvolving only main features“the overall pattern of his life”
(s)overallincluding everything“the overall cost”