Word: backfill
Part of speech: Noun
Syllables: back
fill
Definition: That which backfills; a replacement.
Morphemes:
Affix: back
Language: en
PoS: Verb
Meaning: To make a back for; to furnish with a back.
Affix: fill
Language: en
PoS: Noun
Meaning: One of the thills or shafts of a carriage.