affection vs regard

affection and regard both are nouns.

Word	Noun	Adjective	Verb	Adverb
affection	Yes	No	No	No
regard	Yes	No	Yes	No

As nouns, regard is a hyponym of affection; that is, regard is a word with a more specific, narrower meaning than affection:

Other hyponyms of affection include attachment, fond regard, protectiveness, respect, soft spot.

affection (noun)	regard (noun)
a positive feeling of liking	a long fixed look
	(usually preceded by `in') a detail or point
	paying particular notice (as to children or helpless people)
	an attitude of admiration or esteem
	(usually plural) a polite expression of desire for someone's welfare
	a feeling of friendship and esteem
	the condition of being honored (esteemed or respected or well regarded)

affection (verb)	regard (verb)
	deem to be
	look at attentively
	connect closely and often incriminatingly