As nouns the difference between registrant and applicant
is that registrant is one who registers something or is registered while applicant is one who applies for something; one who makes request; a petitioner.
registrant
English
Noun
(
en noun)
One who registers something or is registered.
Anagrams
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applicant
English
Noun
(
en noun)
One who applies for something; one who makes request; a petitioner.
The third coordinate (or z-coodinate) in a three dimensional coordinate system.