[berekuk]

Technically all numbers are comparable.

[dexterdog]

What about imaginary numbers?

[pmalynin]

You can still compare them, e.g two numbers could or couldn't be equal. Equality is a form of comparison

[ZenoArrow]

1 != sqrt(-1). That's an example of a comparison between a real number and an imaginary number.

[hghdfgv]

Technically incorrect: http://mrob.com/pub/math/largenum-2.html

[germanier]

That's a rather narrow definition of comparability. If nothing else said, one would understand the term with regards to the relation of any partially ordered set – not only the one implicitly defined on that page.

[mrob27]

I define a non-word "uncomparable" to mean something specific and rather arbitrary, but I do not intend it to be the antonym of the real word "comparable". I'll try to clarify this on the webpage you linked to. - Robert Munafo

[scarmig]

Would a tl;dr here be:

Is BB(26) - BB(25) greater than or less than BB(25)?

[wtbob]

Technically all nouns are comparable under equality.