Jidda vs Jiddah

Jidda and Jiddah both are nouns.

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

As nouns, Jidda and Jiddah are synonyms defined as:

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

Other synonyms of Jidda include Jed'dah, Jeddah.

Jidda (noun)	Jiddah (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