As a noun bravery is
(usually|uncountable) being brave, courageousness.
gallantery
Not English
Gallantery has no English definition. It may be misspelled.
bravery
English
Noun
(en-noun)
(usually, uncountable) Being brave, courageousness.
(countable) A brave act.
Synonyms
* (being brave) bravehood, braveness, courageousness, fearlessness; courage, pluck, valor; see also