Rubicon vs point of no return

Rubicon and point of no return both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rubicon	Yes	No	No	No
point of no return	Yes	No	No	No

As nouns, Rubicon and point of no return are synonyms defined as:

Rubicon and point of no return: a line that when crossed permits of no return and typically results in irrevocable commitment

Rubicon (noun)	point of no return (noun)
a line that when crossed permits of no return and typically results in irrevocable commitment	a line that when crossed permits of no return and typically results in irrevocable commitment
the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war