I will attempt to illustrate my question via example. Let's say we have two verbs which are homonyms of eachother: "fleeber" and "fleeber". The first means "to create a soft sound" and the second means "to move in a zig zag pattern" (the definitions themselves are not relevant). However, these two verbs differ in their conjugations: the first's singular past tense is conjugated as "fleebed" and the second as "flobber".
This pair of words, "fleeber" and "fleeber" is an example of a pair I'm looking for. They have the same part of speech, same simplified form (in the case of verbs: the same infinitive, "to fleeber"), but differ in at least one inflection. My question is if such a pair of words exists in any known language.
This is for an application I'm writing that tries to find the base form of a word given its inflected version to help me study a language. The language is Russian, so if you can find an example in Russian that would be serendipitous :)