Although malware and virus are [sort of] interchangeable terms, SunArrow is still right. Typically, anti-virus software actively scans for a variety of computer viruses and threats. Malwarebytes only scans when you want it to, hence the protection is not active as such.
Sorry, i just have to say this:
Malwarebytes has real time protection, it's not scan only type of software(it was scan only like in 2008 i believe)