lamentation vs expression

lamentation and expression both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamentation	Yes	No	No	No
expression	Yes	No	No	No

As nouns, expression is a hypernym of lamentation; that is, expression is a word with a broader meaning than lamentation:

Other hypernyms of lamentation include activity, manifestation, reflection, reflexion.

lamentation (noun)	expression (noun)
the passionate and demonstrative activity of expressing grief	the act of forcing something out by squeezing or pressing
a cry of sorrow and grief	the feelings expressed on a person's face
	a word or phrase that particular people use in particular situations
	the style of expressing yourself
	expression without words
	a group of symbols that make a mathematical statement
	the communication (in speech or writing) of your beliefs or opinions
	a group of words that form a constituent of a sentence and are considered as a single unit
	(genetics) the process of expressing a gene