药物学家

• 艹(grass; plant)RADICAL
• 约(promise; bind)PHONETIC

Medicine is made from grass and plants, sounding like "wish" or "promise".

• ⺍(two hands (indicating learning))ASSOCIATIVE
• 冖(roof; house)ASSOCIATIVE
• 子(child)RADICAL

A child sitting under a roof with two hands diligently studying represents learning.

• 亻(person; human)RADICAL
• 家(family; household)PHONO-SEMANTIC

A person who specializes in making furniture is called a carpenter (house craftsman).