As nouns the difference between subhead and subheader
is that subhead is a subheading or subtitle while subheader is (computing) a header that appears below another header and describes a subsection of its contents.
subhead
English
Noun
(
en noun)
A subheading or subtitle
*{{quote-news, 2009, January 27, Vinay Menon, Toronto's more than just a motto, Toronto Star citation
, passage=Allow me now to reprint the headline and
subhead from a story in the Sunday Star
subheader
English
Noun
(
en noun)
(computing) A header that appears below another header and describes a subsection of its contents.