As nouns the difference between janitor and custodians
is that janitor is (chiefly|us) someone who looks after the maintenance and cleaning of a public building while custodians is .
janitor
Noun
(en noun) (female:'' janitress''' or '''janitrix (''rare ))
(chiefly, US) someone who looks after the maintenance and cleaning of a public building.
a doorman
Synonyms
* maintenance person
* (mostly British ) caretaker
* cleaner
* (British) concierge
* custodian
* (One who cleans and maintains a garden) groundskeeper
* curator
* porter