transition vs changeover

transition and changeover both are nouns.

Word	Noun	Adjective	Verb	Adverb
transition	Yes	No	Yes	No
changeover	Yes	No	No	No

As nouns, transition and changeover are synonyms defined as:

Other synonyms of transition include conversion.

transition (noun)	changeover (noun)
the act of passing from one state or place to the next	an event that results in a transformation
a passage that connects a topic to one that follows
a musical passage moving from one key to another
an event that results in a transformation
a change from one place or state or subject or stage to another

transition (verb)	changeover (verb)
make or undergo a transition (from one state or system to another)
cause to convert or undergo a transition