WORD / COMMON PLURAL FORM
area / areas
album / albums
apparatus / apparatuses
aquarium / aquariums (or, rarely, aquaria)
bacterium / bacteria
cactus / cacti (or cactuses)
campus / campuses
circus / circuses
dilemma / dilemmas
drama / dramas
erratum / errata
formula / formulas (or formulae)
fungus / fungi (or funguses)
gymnasium / gymnasiums
index / indexes (or indices)
larva / larvae
medium / media (mediums is also possible, but only to refer to
those who channel spirits)
museum / museums
nucleus / nuclei (or nucleuses)
radius / radii (or radiuses)
referendum / referendums (or referenda)
stadium / stadiums
stimulus / stimuli
suffix / suffixes
syllabus / syllabi (or syllabuses)
vertebra / vertebrae (or vertebras)
virus / viruses
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