Answer:

acronyms

AnswerCrossword Clue
ACRONYMSMnemonic devices
ACRONYMSUNICEF and UNESCO
ACRONYMSCARE and CORE
ACRONYMSSALT and NAFTA
ACRONYMSNATO and AWOL, e.g.
ACRONYMSMoMA and Epcot, e.g.
ACRONYMSWords formed from initial letters
ACRONYMS'MoMA' and 'OPEC,' e.g.
ACRONYMSOPEC, NATO, etc.
ACRONYMSOPEC and NATO