The best replacement for tumor is cyst.

The best alternatives to tumor are rated as following:
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★★★★★  cancer
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★  malignant tumor
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  hypothalamic tumor
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  diseminating cancer

Your alternative for tumor is not listed? Suggest!
Speaking about tumor, one probably shouldn't forget about seizures.

Other search terms related to tumor and their ratings are:
★★★★★ seizures
★★ cancer
★★ vomiting
★ intracranial pressure
You have in mind a companion for tumor and it is not yet here? Propose!



Google Trends

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tumor
cyst
cancer