alum
3 synonyms for alum, grouped by meaning and by how common each one is.
Noun — A crystalline mineral salt of aluminium, traditionally used in dyeing, tanning, and as an astringent.
Synonyms
Everyday swaps
Common words most readers know — safe in any writing.
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.
Etymology
From Latin alumen via Anglo-Norman alum — unrelated in origin to the graduate sense, which is a modern short form of "alumnus/alumna."
Full origin of alum →