If I take a position, then call my attorney and have that position listed as an asset in my will, it is an investment.
If I take a position expecting the value of it to rise, and there is any chance (greater than, say 10%) that I will exit that position in the next few years, it is a trade.
If I take a position and I expect it to decline in value, it is an expense.
Buying a piece of property that I expect to leave to an heir is an investment.
Buying a residential house is at best a trade, maybe an expense.
Buying a car is an expense.
Buying shares in anything is a trade.
Best regards,
Howard