switch vs diphthongise

switch is a noun but diphthongise is not a noun.

Word	Noun	Adjective	Verb	Adverb
switch	Yes	No	Yes	No
diphthongise	No	No	Yes	No

As verbs, diphthongise is a hyponym of switch; that is, diphthongise is a word with a more specific, narrower meaning than switch:

Other hyponyms of switch include transition, shift, break, channel-surf, surf, jump, leap, diphthongize, cut, break.

switch (noun)	diphthongise (noun)
the act of changing one thing or position for another
a basketball maneuver; two defensive players shift assignments so that each guards the player usually guarded by the other
a flexible implement used as an instrument of punishment
control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit
railroad track having two movable rails and necessary connections; used to turn a train from one track to another or to store rolling stock
hairpiece consisting of a tress of false hair; used by women to give shape to a coiffure
an event in which one thing is substituted for another

switch (verb)	diphthongise (verb)
reverse (a direction, attitude, or course of action)	change from a simple vowel to a diphthong
make a shift in or exchange of
lay aside, abandon, or leave for another
change over, change around, as to a new order or sequence
cause to go on or to be engaged or set in operation
flog with or as if with a flexible rod
exchange or give (something) in exchange for