怨語 is read as えんご (engo) and means grudge.
えんご
engo
おんねん
deep-seated grudge
らくご
rakugo
たんご
word
きょうつうご
standard language (language variety understood throughout a country)
わご
Japanese language
じゅつご
technical term
へいけものがたり
The Tale of the Heike
げんご
original word
ろんご
the Analects of Confucius (one of the Four Books)
ゆめものがたり
account of a dream
ごうせいご
compound word
えいたんご
English word