allegation vs lodgement

allegation and lodgement both are nouns.

Word	Noun	Adjective	Verb	Adverb
allegation	Yes	No	No	No
lodgement	Yes	No	No	No

As nouns, lodgement is a hyponym of allegation; that is, lodgement is a word with a more specific, narrower meaning than allegation:

allegation: (law) a formal accusation against somebody (often in a court of law)
lodgement: the state or quality of being lodged or fixed even temporarily

Other hyponyms of allegation include lodging, lodgment, grievance, plaint.

allegation (noun)	lodgement (noun)
(law) a formal accusation against somebody (often in a court of law)	the state or quality of being lodged or fixed even temporarily
statements affirming or denying certain matters of fact that you are prepared to prove