List of Plural Nouns
Two plural forms with different meanings
Some nouns have two plural forms with different meanings:
1. Both forms follow the English pattern:
e.g. cloth — cloths (i.e. 'some pieces of material to wipe something up')
clothes (i.e. 'garments')
penny - pennies (i.e. 'single coins') 
pence (i.e. 'a sum of money')
2.Foreign plurals occur along with regular plurals:
genius - genii (i.e. 'supernatural beings') - geniuses (i.e. 'very intelligent persons')
formula - formulae (i.e. 'a mathematical term') - formulas (i.e. 'a general term')
| Singular nouns | Plural nouns | 
|---|---|
| analysis | analyses | 
| status | status/statuses | 
| moose | moose | 
| crisis | crises | 
| fish | fish / fishes | 
| series | series | 
| appendix | appendixes / appendices | 
| Mr. / Mr / Mister | Misters / Messrs. / Messrs | 
| sheep | sheep | 
| bus | buses / US also busses | 
| formula | formulae / formulas | 
| life | lives | 
| apparatus | apparatuses | 
| deer | deer | 
| ox | oxen | 
| focus | focuses / foci | 
| basis | bases | 
| platypus | platypuses | 
| cactus | cacti / cactuses | 
| sheep | sheep | 
| analysis | analyses | 
| woman | women | 
| equipment | equipment | 
| dice | dice | 
| leaf | leaves | 
| life | lives | 
| phenomenon | phenomena | 
| staff | staff | 
| alumnus | alumni | 
| genius | geniuses | 
| radius | radii / radiuses | 
| staff | staff | 
| alumnus | alumni | 
| software | software | 
| data | data | 
| addendum | addenda | 
| virus | viruses | 
| synopsis | synopses | 
| mongoose | mongooses | 
| genus | genera | 
| formula | formulae / formulas | 
| roof | roofs | 
| phenomenon | phenomena | 
| medium | media / mediums | 
| business | businesses | 
| datum | data | 
| chassis | chassis | 
| crisis | crises | 
| hero | heroes | 
| axis | axes |