atomic weapon vs thermonuclear

atomic weapon

noun

A nuclear weapon.

thermonuclear

noun

A thermonuclear weapon.

adj

Of, or relating to the use of atomic weapons based on such fusion, especially as distinguished from those based on fission.
Of, or relating to the fusion of atomic nuclei at high temperatures.

How often have the words atomic weapon and thermonuclear occurred in a corpus of books? (source: Google Ngram Viewer )