There are plenty of them. Here is a list of different NLP problems:
- spam detection
- text genre categorization (news, fiction, science paper)
- finding similar texts (for example search for similar articles)
- find something about author (genre, native-speaker/non-native-speaker)
- create automatic grader for student’s work
- check text for plagiarism
- create an application that looks for grammatical errors
Pretty much any conference paper can give an idea about an NLP project. For example you can think about text summarization, lemmatisation, tokenization, correct splitting text in sentences, etc.
solved What are some simple NLP projects that a CS undergrad can try implementing? [closed]