• Common abbreviation
• Common abbreviature
• Common abetter
• Common acronym
• Common adder
• Common adversary
• Common aeroallergen
• Common affliction
• Common ailment
• Common alias
• Common allergen
• Common ancestor
• Common anglicism
• Common antonym
• Common apocope
• Common assumption
• Common backswimmer
• Common behoof
• Common belief
• Common britishism