Related by context. Frequent words. (Click for all words.) 57 cerium 56 REEs 55 rare earth 55 lanthanum 54 rare earths 52 Nd 51 Germanium 51 Rare earths 50 yttrium 50 tellurium 50 magnesium 49 iridium 49 tantalum 49 Rare earth 49 indium 48 metal alloys 47 vanadium 47 HREE 47 hafnium 47 REE 47 niobium 47 aluminum oxide 46 fluorite 46 lithium 46 molybdenum 46 zircon 46 Niobium 46 tungsten 46 ferrite 45 olivine 45 rhodium 45 boron 45 zirconium 45 oxides 45 chromium 45 alloy 45 alloys 45 gallium 44 titanium oxide 44 dioxide 44 NiMH batteries 44 cobalt 44 ruthenium 44 rhenium 44 absorbers 44 polycrystalline silicon 44 silicate 43 antimony 43 Rare Earth 43 titanium 43 fluorine 43 polycrystalline 43 feldspar 43 apatite 43 deuterium 42 silicates 42 electromagnets 42 Tantalum 42 metal alloy 42 zinc 42 rubidium 42 coltan 42 gallium arsenide 42 TiO2 42 moly 42 iron oxides 42 silica 42 semiconducting 41 phosphors 41 ilmenite 41 diode lasers 41 Coking coal 41 graphite 41 Molybdenum 41 strontium 41 silicon carbide 41 zirconia 41 barium 41 piezoelectric 41 lithium carbonate 41 Rare Earths 41 manganese 40 rutile 40 silicone rubber 40 sintered 40 oxalate 40 sinter 40 LED backlights 40 magnetic particles 40 neutrons 40 germanium 40 nitride 40 Li ion batteries 40 Tungsten 40 rectifiers 40 aluminum alloys 40 isomers 40 halogens 40 Rechargeable 40 isotope 39 ductile