holonyms

Merfolk is a holonym of mergirl.

As nouns the difference between merfolk and mergirl

is that merfolk is mythical creatures that are human from the waist up and fish from the waist down while mergirl is a mermaid.

Couplezilla is a holonym of groomzilla.

In usually|humorous|lang=en terms the difference between couplezilla and groomzilla

is that couplezilla is (usually|humorous) a couple who, in the course of planning their wedding, display difficult, selfish, narcissistic behaviour relating to the event while groomzilla is (usually|humorous) a demanding and perfectionistic groom (man who is to be married).

As nouns the difference between couplezilla and groomzilla

is that couplezilla is (usually|humorous) a couple who, in the course of planning their wedding, display difficult, selfish, narcissistic behaviour relating to the event while groomzilla is (usually|humorous) a demanding and perfectionistic groom (man who is to be married).

Poset is a holonym of ultrafilter.

As nouns the difference between poset and ultrafilter

is that poset is (set theory) a partially ordered set while ultrafilter is a proper filter which has a law of dichotomy for complements.