Hi V_T
Yes, I have heard of those. I don't pretend to be an Islamic scholar. I don't speak arabic, for a start.
As I understand it those English words are translations of ambiguous arabic words that could also be translated as the House of the West (those Crusaders who came to wage war on Islam in te 11th/12th century). Furthermore, they do not appear in versions of the Koran/Qu'ran prior to the 20th century.
Because I'm no scholar of Islam, I'm not going to try and discuss what I don't know. It may be that you know better.
What I do know is that there are many Islam-hate sites that use those words to spread fear and hatred.
What I also know is that the Muslims I know completely disavow terrorism.
What I also know is that when that man Darren Osborne drove his rented van at speed into a crowd of worshippers, the religious leader prevented the congregation from hurting the man who had sought to kill them.
What I also know is that the newspapers and hate sites in this country have sought to spread fear and division in this country.
It's a long read, and you may get bored, but try this series of four articles for a start:
https://medium.com/@tswriting/sleep-walking-into-a-war-b1e7e42f85bc