Stop codons are

Three codons UAG, UAA and UGA are stop codons or non-sense codons. They do not code for any amino acid. AUG works as initiation codon in eukaryotes and prokaryotes. In rare case GUG also serves as initiation codon in bacterial protein synthesis. UAC coded for tyrosine, UGG coded for tryptophan, AGU coded for serine, AGA coded for argenine.