Linked from
The 6 pages that link to Acronym, each with the reason it gives.
PortmanteauCompared with: Acronyms combine initials, not truncated word parts and their meanings.
AbbreviationBroader topic: It turns a phrase’s initials into a pronounceable word, as in “NASA.”
Word formationBroader topic: Acronyms turn multiword names into pronounceable vocabulary items.
AnagramCompared with: Acronyms select initials; anagrams use every letter in the source expression.