Aerosol can and Pepper spray

Aerosol can noun - A dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas).

Pepper spray and aerosol can are semantically related. In some cases you can replace phrase "Pepper spray" with "Aerosol can", this phrases are similar.

Pepper spray noun - A nonlethal aerosol spray made with the pepper derivative oleoresin capiscum; used to cause temporary blindness and incapacitate an attacker; also used as a bear deterrent.

Aerosol can and pepper spray are semantically related. You can use "Aerosol can" instead a noun phrase "Pepper spray".