ti-lo
Couldn't this be differentiated like this ? https://taginfo.openstreetmap.org/keys/ngo

A lawyer is something totally different to me 
https://wiki.openstreetmap.org/wiki/Tag:office=lawyer
https://en.wikipedia.org/wiki/Lawyer

Otherwise every consumer protection institution would have to be called "lawyer" ?
https://en.wikipedia.org/wiki/Consumer_protection

The "specialty" (of whatever institution, in case they give legal advice) could also be expressed using https://taginfo.openstreetmap.org/keys/lawyer