What's the difference between companion and unfellow?

Companion

Definition:

(n.) One who accompanies or is in company with another for a longer or shorter period, either from choice or casually; one who is much in the company of, or is associated with, another or others; an associate; a comrade; a consort; a partner.
(n.) A knight of the lowest rank in certain orders; as, a companion of the Bath.
(n.) A fellow; -- in contempt.
(n.) A skylight on an upper deck with frames and sashes of various shapes, to admit light to a cabin or lower deck.
(n.) A wooden hood or penthouse covering the companion way; a companion hatch.
(v. t.) To be a companion to; to attend on; to accompany.
(v. t.) To qualify as a companion; to make equal.

Example Sentences:

(1) In the companion paper, we quantitatively account for the observation that the ability of a solute to promote fusion depends on its permeability properties and the method of swelling.
(2) Headache, vegetative und neurological symptoms are frequent but not necessary companions.
(3) The preceding companion paper presents a biochemical study of two abnormal protein 4.1 species from individuals with the red blood cell disorder, hereditary elliptocytosis.
(4) A companion paper further discusses the nature of peaks B and C materials.
(5) I used to tease him with the suggestion he had chosen me as walking companion because I had no mathematics at all and so he was safe from prying questions, but in fact now and then he did used to tell me about what he was doing – and how clear it all seemed when he spoke!
(6) His companions eventually apologised to me, but only after apologising to my boyfriend, and only after being kicked out by restaurant staff who reinforced that the behaviour was unacceptable.
(7) These results are compared with experimental data on angular scattering from liver, muscle, and blood, reported in a companion paper [J. Acoust.
(8) The sources of data are the 1982 and 1984 National Long Term Care Surveys and the companion 1982 Informal Caregivers Survey.
(9) Microliths are rarely encountered in tracheal washings from companion animals.
(10) This is the first report of companion cell lines, one malignant and one normal, established from the same organ.
(11) These results form a base line with which luteolytic changes described in the companion study (Paavola, L.G.
(12) Money was tight and hunger was a constant companion.
(13) Findings based on applying the procedure to simultaneously recorded spike and event trains are described in a companion paper (Frostig et al.
(14) Her companion, a man in his fifties, also refused to give his name to the “Lugen Presse” (liar press, a term coined by the Nazis and frequently chanted at Pegida events), but is quick to add: “We’ve nothing against helping foreigners in need, like those poor people in Syria, but we should be helping them in their own country, not bringing them over here.” The demonstrations feel like an invitation for anyone to voice any grievance.
(15) In a companion microneurographic study (Schmidt et al.
(16) He throws confessions about his love of guns or his lust for violence into restaurant conversations, but his inanely sophisticated companions carry on conversing about the varieties of sushi or the use of fur by leading designers.
(17) This paper is a companion to an earlier report on prenatal visiting patterns in Aberdeen, Scotland (McKinlay, 1970).
(18) At that time, more patients were depressed and had a lower income, fewer wanted a transplant, and five had lost their living companion.
(19) The people who were persecuting him and his companions and his sympathizers.
(20) Discrimination between individual strangers and companions was examined in day-old domestic chicks.