I recently watched a film called

> パパはわるものチャンピオン

and wondered whether the particle 'の' had been omitted between 'わるもの' and
'チャンピオン' in the film's title. Similarly, my mind turned to phrases like

> 東京大学

Is there a reason for the lack of 'の' between these sets of nouns? Thank you!
(Sorry to waste time with what is probably a very simple question...)
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2020-04-11T07:43:40.693
76497
2020-04-11T07:43:40.693
36655
question
particle-の nouns
Is の omitted in these cases?