manifestant

In a sentence

• Le manifestant a crié des slogans.

  The protester shouted slogans.

  Here, 'manifestant' is used as a noun referring to an individual participating in a demonstration.

• Elle était manifestante pour la cause environnementale.

  She was a protester for the environmental cause.

  In this case, 'manifestante' is the feminine form of the noun to match the gender of the individual being talked about.

• Les manifestations de rue prennent souvent trop de temps.

  Street protests often take too much time.

  Here, the word 'manifestations' refers to the plural noun form indicating organized public protests, demonstrating a change in meaning to focus on the events themselves.