I found these answers from the same user that essentially suggest the same word.
Does it make sense to write two answers to say the same thing, and if so, when? What is the purpose of writing a different answer, instead of editing the first answer?
SE sites where answers are generally highly objective -- technical and science topics, mostly -- answering the same question twice doesn't make a lot of sense since your second answer should invalidate your first.
EL&U has some questions where there is a sufficiently agreed upon right answer, making others wrong and a second answer inappropriate, particularly those about grammar or spelling. Many questions here though, possibly even most, can be pretty subjective; this is especially true of those with tags like word-choice, single-word-requests, and politeness, and to a somewhat lesser extent differences, idioms, and word-usage.
While providing multiple options in a single answer is common, it can make future research via the site much less useful. If I want help picking a word, find that it's been asked about before, and see that the accepted answer (or one with the most upvotes) has 3 different options, how do I know what the OP actually accepted or what people were voting for? Sometimes comments help narrow it down, but often there are none or the ones that are there are misleading, e.g. 10 upvotes that are invisibly for the first suggested option in the answer and one comment that says that the first option is bad.
I propose that for questions with a large degree of subjectivity, not only are multiple answers by the same person acceptable, they should even be encouraged.
It seems strange but there are good reason for one author to make two separate answers even for objective questions. Sometimes it is not clear what the original question is asking (say for a word choice) and there is more than one possibility. The general culture is to list -all- the ones you think are good or close in hopes that one of them will satisfy the OP. But for future readers it is probably better to have a separate answer for each one (so that each can be voted on separately).
If you do add a second answer, SE has thought of that possibility already by giving you a message asking if you really want to do that or if you think it'd be better to edit your other question. If you're trying to add an answer that is very similar to another of yours, you should be editing the earlier one.
@kiamlaluno, that second answer was a joke. If you went on chat, you would see that originally MrHen had difficulty choosing the correct answer because all of the answers had truth, so I said could I post another answer listing everything, and he said yes. So, I did, but he said it didn't help much, cos I didn't put what he was looking for into my second answer either.