If something is probably true, then it may or may not actually be true.
Something is ostensibly true if someone has told you that it is supposed to be the case.
Guesses are more assertive than hunches. A hunch can be seen as a hint or feeling and is something that typically indicates a suspected outcome or result:
I have a hunch that they are lying.
My hunch suggests otherwise.
I am only working on hunches.
The conveyed message is that there isn't much rhyme or reason behind a hunch. The only backing is... just that it exists. You very rarely have control over hunches and once you can point toward why you have a hunch it starts becoming less of a hunch and more of a guess.
A guess can drift from potshots to educated guesses and are considered more challengeable. Where a hunch simply describes your feelings or thoughts, a guess is expected to have some meat behind it. Asking why of a guess is expected. Asking why of a hunch is pretty pointless.
In terms of use, guess can be seen as a strict upgrade from hunch:
I guess that they are lying.
I guess otherwise.
I am only working on guesses.
The scale does continue from there, but the range of guess is very broad and context is important:
If you had to guess, what is the population of Mexico?
I don't know the answer, but I can guess.
Are you guessing?
This is an educated guess.
I have no idea, but my guess is five.
I can guess.
Beyond guess are words like answer:
This is my answer.
What is the answer?
Is that your final answer?
Best Answer
As reported by the NOAD, into has the following meanings:
onto means:
As side note, in some cases it is correct to write onto, but in some cases it is correct to write on to.