portmanteau_word
1. [ noun ] (linguistics) a new word formed by joining two others and combining their meanings
Synonyms: portmanteau blend
Examples:

"`smog' is a blend of `smoke' and `fog'" "`motel' is a portmanteau word made by combining `motor' and `hotel'" "`brunch' is a well-known portmanteau"

Related terms: word neologism motel smog brunch shopaholic workaholic dandle