Think up and Work up

Think up verb - To create or think of by clever use of the imagination.

Work up and think up are semantically related. in create topic. In some cases you can use "Work up" instead a verb "Think up", when it comes to topics like bring about.

Work up verb - To produce or bring about especially by long or repeated effort.

Think up and work up are semantically related. Sometimes you can use "Think up" instead a verb "Work up".