Learn English – The difference between superior and upper in medical terminology

Beggar is obviously different from the other two in that he is not offering goods for sale, just begging.

From the definitions, both hawkers and peddlers travel about selling things, but in my mind a hawker is more of a person who calls out their goods for sale in a public place, while a peddler may be going door to door.

The definitions will reveal the difference.

Comparably

in a similar way or to a similar degree.

Comparatively

to a moderate degree as compared to something else; relatively.

Source: Oxford Dictionaries

...but it is in fact a habit which is similarly(comparably) easy to acquire

It is contradictory to use 'but'(which introduces a view that is different from what was stated in the first part of the sentence) and comparably(similarly) in the same fragment.

... but it is in fact a habit which is relatively(comparatively) easy to acquire

Since a comparison is being made here, it is absolutely correct to use 'comparatively'. Comparatively and but correspond with each other in terms of meaning.

Comparatively as well as comparably, convey the meaning of comparison(estimate of the similarities or dissimilarities between two things or people) but it must be noted that comparably talks only about the similarities whereas comparatively takes both similarities and dissimilarities into consideration.