back order
3 synonyms for back order, grouped by meaning and by how common each one is.
Noun — An order for goods that a seller has accepted but cannot ship yet because the item is out of stock, and which will be sent once new stock arrives.
Synonyms
Less common
Still standard English, but they carry more weight.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
How to use back order
The word patterns that sound natural to a native speaker.
Commercial and retail. Written as two words as a noun and usually hyphenated as a verb.