mer / mirr / murre / myrrh [mɜr]
mer – n. – 1. Chemistry a unit in a polymer; 2. a mythical sea person
mirr – n. & v. – n. 1. Optics - a unit of measurement; 2. Finances – acronym – modified internal rate of return - as part of a formula; v. – tingle, quiver, tremble
murre – n. – a guillemot or auk, especially the razon bill, Alca torda, or of the genus Uria; often having a white breast
myrrh – n. – 1. a bitter, aromatic tree resin, Commiphora spp., used in perfumes and medicines; 2. balm, a soothing, healing substance; 3. sweet cicely, Myrrhis odorata, known as British myrrh