[mothered]

What's the difference between an antivirus and an antimalware?

An AV focuses on specifics, that Is, specific kinds of virus/malware hence It's considered an Antivirus "per se". Whereas an Anti-Malware covers a vast range Inclusive of viruses, malware, worms, trojans etc. That said, an Anti-Malware (MBAM In this case), does not protect against "viruses" In the same capacity as an AV.

By name and functionality, an Anti-Malware Is not classed as an Antivirus, thus can run side-by-side with an AV without compatibility Issues.