1. A word from the same root, and usually a similar pronunciation, as another; such as, "beautiful" and "beauteous".
2. Words which are almost homonyms, but have slight differences in spelling and have different meanings.
3. Having a similar sound, but different orthography and different meaning; said of certain words, as "all" and "awl"; "hair" and "hare".
4. Having the same derivation; said of certain words; such as, "man", "mankind", "manhood", etc.
5. Containing the same root or stem; such as, the words "wise" and "wisdom".

Other examples:

• "alternately" and "alternatively"
• "affect" and "effect"
• "collision" and "collusion"
• "conjuncture" and "conjecture"
• "continuous" and "contiguous"
• "farther" and "further"
• "farthest" and "furthest"