The biggest differences are going to be the media it is targeted for.
A tv is expecting to display 1280x720, 1920x1080 for resolutions and will include speakers , and several ports, component, hdmi, etc.
Monitor is going to target its native resolution and scale to match whatever is outside native resolution.
They both can scale but the difference is the tv is going to have a much better scaler designed for the standard resolutions. When it was designed they knew what the use would be and it was designed for those first. The monitor scaler is more general purpose where they can't be sure what other resolutions will be used and so every resolution is not tweaked to perfection, it is considered secondary.
Whenever any consumer electronics are designed the design teams start with the primary purpose, secondary purpose, optional purpose on the very first page of the proposal and that determines where the attention is spent.
Resolution is not everything. Be sure to check the pixel pitch as well. The lower the better. A tv can get away with a pitch of .31 but a monitor would need .28 or better because you are much closer to the display. I have seen a lot of displays that look great at a distance, but up close would make terrible pc monitors.