running title vs running head

running title and running head both are nouns.

Word	Noun	Adjective	Verb	Adverb
running title	Yes	No	No	No
running head	Yes	No	No	No

As nouns, running head is a hypernym of running title; that is, running head is a word with a broader meaning than running title:

running title: the title (or a shortened title) of a book used as a running head
running head: a heading printed at the top of every page (or every other page) of a book

Other hypernyms of running title include running headline.

running title (noun)	running head (noun)
the title (or a shortened title) of a book used as a running head	a heading printed at the top of every page (or every other page) of a book