As verbs the difference between fluctuate and fructuate
is that fluctuate is to vary irregularly; to swing while fructuate is to bear fruit.
fluctuate
English
Verb
(en-verb)
To vary irregularly; to swing.
To undulate.
To cause to vary irregularly.
fructuate
English
Verb
(fructuat)
(archaic) to bear fruit