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One can find many synonyms for the word undulate online. Thesaurus online is a good place to find synonyms as is The Free Dictionary and Synonyms-For.
Check this Wiki category and you'll find many synonyms.
senior, superior, higher, chief
director, president, chief, executive, spokesman
There are many synonyms for arrive. These include access, alight, attain, disembark and appear. You can find more synonyms by going to the Thesaurus website.
Synonyms for "get" - To acquire, find or receive
There are many synonyms for the term rotate. A few synonyms for the word rotate would be swivel, spin, revolve, whirl, twist, and twirl. One can find lots of synonyms in a thesaurus.
There are many different synonyms for the word gratification. It could simply mean fulfillment or glee. Many people have different meanings for words, but if you look on a simple thesaurus, you can find many different synonyms for gratification.
There are many synonyms of the word 'backlash'. One such synonym is recoil and another is rebound. If one looks in a thesaurus one can find more synonyms for the word.
Synonyms for "get" - To acquire, find or receive
leader, boss, master, skipper, head, chief, commander
master, chief, ruler, commander, head, overlord, overseer