As nouns the difference between subsection and subheader
is that subsection is a defined part of a section while subheader is (computing) a header that appears below another header and describes a subsection of its contents.
subsection
English
Noun
(
en noun)
A defined part of a section.
A subpart of a legal document such as law.
subheader
English
Noun
(
en noun)
(computing) A header that appears below another header and describes a subsection of its contents.