Odynophagia is a medical condition characterized by pain on swallowing due to a disorder of the oesophagus. It's not a countable noun. It has no plural
"Biopsy" is the singular form, while "biopsies" is the plural form.
The word "louse" is singular. The plural form is "lice."
The word crisis is singular. The plural form of crisis is crises.
The singular form is it, the plural form is they(subjective) and them (objective).
The plural form of the singular word "oasis" is "oases."
The word community is singular; the plural form is communities.
The singular form is friend; the plural form is friends.
No, the word "list" is singular. The plural form of "list" is "lists."
The word team is singular; the plural form is teams.
Steroids is plural. The singular form of the word is steroid.
its singular there is no plural form of rendezvous
That is the singular form; the plural form is those.