Jeddah vs Jidda

Jeddah and Jidda both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jeddah	Yes	No	No	No
Jidda	Yes	No	No	No

As nouns, Jeddah and Jidda are synonyms defined as:

Jeddah and Jidda: port city in western Saudi Arabia on the Red Sea; near Mecca

Other synonyms of Jeddah include Jed'dah, Jiddah.

Jeddah (noun)	Jidda (noun)
port city in western Saudi Arabia on the Red Sea; near Mecca	port city in western Saudi Arabia on the Red Sea; near Mecca