They fought for 'freedom of speech'. = They fought for the right to/of 'free speech'. [=they fought for the legal right to express their opinions freely]
He kept revising his 'speech' [=the words that he had written for his speech] right up until the last minute.
She thanked us in her 'acceptance speech'. [=a speech given by someone receiving an award or prize]
(..) My young lady and my mistress, masters, you are all welcome We'll e'en to it like French falconers, fly at anything we see We'll have a speech straight. Come, a passionate speech - What speech, my lord? - I heard thee speak a speech once But it was never acted, or if it was, (..)2015 Hamlet
(..) for true pay, which are not sterling My lord, he hath importuned me with love in honourable fashion Aye, fashion you may call it And hath given countenance to his speech, my lord, with all the vows of heaven I do know when the blood bums how prodigally the soul lends the tongue vows (..)2015 Hamlet