While they belong to the same drug type, their chemical structures have differences. These are the 3 that we will focus on for this Substance Spotlight. 

The NBOMe series are analogues of the 2C series of psychedelic phenethylamine drugs that include an N-methoxybenzyl substituent. NBOMes are also referred to as a research chemicals, or New/Novel Psychoactive Substances (NPS) because they are designed to mimic or produce similar effects to common illicit drugs-in this case, psychedelics. 

Psychedelics are drugs which alter the perception, causing a number of mental effects which manifest or show up in many forms including altered states of consciousness, visual or tactile (feely) effects. 
It is often sold in blotter (paper tab) but can also come in capsules, tablets, as a liquid, or as a powder. It is often mis-sold as LSD as it is much cheaper to produce. Users report an uncomfortable body load with very strong visuals, though with less of a mental aspect than most psychedelics. 

Because they have received a lot of negative coverage in the media and have caused multiple fatalities, NBOMes don’t have a good reputation. Nevertheless, it’s typically safe at lower common doses and some people enjoy its effects.

When using strong+ doses, it may be more likely to cause confusion and be overwhelming than other psychedelics. It could also contribute to HPPD* at a somewhat higher rate.