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難問題 / なんもんだい : n 1）difficult problem or question
難問 / なんもん : n vs 1）perplexity 2）difficult question 3）difficult problem P
難題 / なんだい : n 1）difficult problem 2）challenge P
難文 / なんぶん : n 1）difficult sentence
難し / かたし : arch 1）(adj-f) difficult 2）hard
難くせ / かたくせ : n 1）fault-finding
難治性 / なんちせい : 1）intractable 2）inveterate
難い / かたい / がたい / にくい : 1）(aux-adj) difficult 2）hard P
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難問題

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