This is the 1720th most frequent Japanese word.
もしくは
"もしくは" means "or" or "otherwise."
もしくは is used here as a conjunction to present two alternative options for decision.
山へ行くもしくは海へ行くか決めてください。
Please decide whether to go to the mountains or to the sea.
もしくは connects two possible courses of action, indicating a choice between them.
彼の助けを求めるもしくは他の方法を探すことができます。
You can ask for his help or look for another way.
もしくは links two potential options for the offerings in a disjunctive manner.