However, there are some words that sound very similar to "liar" and could be used in a similar context, depending on the situation:
* "lier": This is a less common word that can be used to refer to someone who lies down, but it's not a perfect replacement for "liar" in most cases.
* "layer": This word refers to a single thickness of something, and while it doesn't sound exactly the same as "liar", it could be used in a humorous way to describe someone who is a habitual liar.
* "lyre": This is a musical instrument, and it sounds very close to "liar" but has a completely different meaning.
Ultimately, there's no true homonym for "liar," and the best substitute will depend on the specific context of your sentence.