Yes, railer is in the scrabble dictionary.

What is railer mean?

To express objections or criticisms in bitter, harsh, or abusive language. See Synonyms at scold. [Middle English railen, from Old French railler, to tease, joke, from Old Provençal ralhar, to chat, joke, from Vulgar Latin *ragulāre, to bray, from Late Latin ragere.]

Is tailer a word?

One who follows or tails surreptitiously, as an investigator.