O is for
obequitate
verb
to ride away on a horse.
obsequious
adjective
obedient or attentive to an excessive or servile degree.
occamy
noun
a metallic alloy that simulates the precious metals silver and gold.
octad
noun
a group or set of eight.
oikology
noun
science of housekeeping.
olivet
noun
artificial pearl.
orfèvrerie
noun
Goldsmith's work.
Definitions from Oxford Languages