proper, fitting, one's own
If you expropriate something, you take it away for your own use although it does not belong to you; governments frequently expropriate private land to use for public purposes.
When something is apropos, it is fitting to the moment or occasion.
If you appropriate something that does not belong to you, you take it for yourself without the right to do so.
A malapropism is an unintentional and usually humorous mistake you make when you use a word that sounds similar to the word you actually intended to use but means something completely different.
Propriety is behaving in a socially acceptable and appropriate way.
money set aside (as by a legislature) for a specific purpose
taking out of an owner's hands (especially taking property by public authority)
not suitable or right or appropriate
an improper demeanor
not suitable for a particular occasion etc
appropriate (as property entrusted to one's care) fraudulently to one's own use
appropriate for a condition or purpose or occasion or a person's character, needs
protected by trademark or patent or copyright
(law) someone who owns (is legal possessor of) a business
an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits
a woman proprietor
Differentiated vocabulary for your students is just a click away.