Compound words result from the union of two or more simple words. They can be phrasal compounds like 'nevertheless' or or fused compounds like 'smog' (smoke and fog). Many books on linguistics mention hybrid words: compound words whose simplex components come from different languages. The usual example given is 'automobile', with the Greed-derived auto and the Latin-derived mobile. Other names for these include mongrel words or mule words.
"Mighty Like a Mule,"
Word Ways: Vol. 12
, Article 4.
Available at: https://digitalcommons.butler.edu/wordways/vol12/iss1/4