A Sinhala thero from the YT channel Authentic Dhamma says in this video, that riya means “vehicle or movement or journey” and ariya means the opposite or “someone who has stopped the samsaric journey”. I cannot find the word riya in the dictionary.
Ariya is there:
ariya : [adj.] noble; distinguished. (m.), a noble man; one who has attained higher knowledge.
Also, the term Bhikkhu would contain bhava + khaya
But I cannot identify that in bhi+ku (?).
Is the Thero right?