column vs agony column

column and agony column both are nouns.

Word	Noun	Adjective	Verb	Adverb
column	Yes	No	No	No
agony column	Yes	No	No	No

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

column (noun)	agony column (noun)
(architecture) a tall vertical cylindrical structure standing upright and used to support a structure	a newspaper column devoted to personal problems
a vertical cylindrical structure standing alone and not supporting anything (such as a monument)
a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands
any tubular or pillar-like supporting structure in the body
an article giving opinions or perspectives
a page or text that is vertically divided
a line of units following one after another
a vertical array of numbers or other information
anything that approximates the shape of a column or tower