realm
noun /relm/
  /relm/
Idioms - an area of activity, interest or knowledge
- in the realm of something in the realm of literature
 - At the end of the speech he seemed to be moving into the realms of fantasy.
 
Extra Examples- In the realm of politics different rules sometimes apply.
 - Most readers are likely to lose interest when he descends into the realms of rhetorical terminology.
 - The euro has moved from the realms of theory into reality.
 - The idea belongs in the realm of science fiction.
 - The research has opened up new realms for investigation.
 - the whole realm of human intellect
 - My new project led me into the realms of psychology.
 - Questions of consciousness lie outside the realm of physics.
 
Oxford Collocations Dictionaryadjective- whole
 - new
 - international
 - …
 
- be in
 - belong in
 - belong to
 - …
 
- beyond the realm of
 - out of the realm of
 - outside the realm of
 - …
 
- the realm of art, politics, science, etc.
 - the realms of fantasy
 - the realms of possibility
 - …
 
 - (formal) a country ruled by a king or queen synonym kingdom
- The Crown maintains armed forces for the defence of the realm.
 
Extra Examples- They fought to defend the realm.
 - peace within the realm
 - wealth acquired outside the realm
 - The great victory was proclaimed throughout the realm.
 - Royal taxation usually had to be for the defence of the realm.
 - There was rejoicing throughout the realm.
 
Oxford Collocations Dictionaryverb + realm- defend
 
- beyond the realm
 - outside the realm
 - in the realm
 - …
 
- a part of the realm
 - the defence/defense of the realm
 
 
Word OriginMiddle English rewme, from Old French reaume, from Latin regimen ‘government’, from regere ‘to rule’. The spelling with -l- (standard from c.1600) was influenced by Old French reiel ‘royal’.
Idioms 
within/beyond the bounds/realms of possibility 
- possible/not possible
- A successful outcome is not beyond the realms of possibility.
 - It is not beyond the bounds of possibility that we'll all meet again one day.