dungeon master
grognard
OSR (old school renaissance)
spell slots
character sheet
megadungeon
adventure module
meat shield
action economy
tank (as in a type of meat shield)
glass canon
experience points
Acronyms and initialism aplenty: TTRPG
FLGS
STR, DEX, CON, INT, WIS, CHA
HP
AC
BBEG
TPK
RAW
RAI
THAC0
XP