there could be different answers depending on the type of start like noun, verb, etc.
for the noun: beginning, opening, origin; advantage; scare, flinch, shock
for the verb: begin, activate, create; startle
and more...
They are synonyms.
Synonyms
They are not synonyms.
synonyms for prominence:importancefamestatureprestige
synonyms
Began and begun.
started began spawned
Some synonyms for underway are, moving, making progress, started, initiated, and under construction. These are the words that are synonyms for undertaken.
I thank so. Cause when you done began, you done started to!
Parade, pace and promenade are synonyms for walk. They begin with P.
Synonyms for START : begin, initiate, commence
They are synonyms.
Synonyms
Relative and kin are synonyms.
They are synonyms.
synonyms
The synonyms for upon is on