Okamnar
From Tolkien Gateway
ocamnar is a Quenya word meaning "diphthong".[1]
It is not know if it is the singular or the plural. If it is the plural, the singular is *ocamna. If it is the singular, the plural would be *ocamnari
Etymology
The word comes from a possible the PQ root *KAM and contains the prefix o-
See also
Other versions
An earlier version of the word is osamnar/samnar from a root SAM. Since Tolkien updated the word, that root would also retroactively be *KAM