Elfs vs. elves
Elves is the standard form.
Elves is the standard form.
Buses is the standard plural in 21st-century English.
Scarfs is the older plural, but scarves is more common in today’s English.
minima in science and mathematics; minimums in general usage.
Plateaus is the usual plural, but the French plateaux is a common secondary form in British English.
The Latin plural is favored in scientific texts. The English plural is favored in general usage.
People is the usual modern plural of person, and persons is reserved for a few specific contexts.