Here are a few:
Radius
Range
Radical
Reciprocal
Rational
Remainder
Root
Ray
Rectangle
Rotation
Reasoning
Ratio
Radian
Ratio
radius
remainder
There is no word - in mathematics or elsewhere - that starts with "younteand".
Words that start with R and end with R:racerradarradiatorrafterrancherrancorratherrazorreaderreaperreappearrearreceiverrecorderrecoverregisterregularregulatorreindeerrelieverremainderrememberreminderremoverrenterreoccurrepairreporterresistorresponderretailerretainerretrieverrevolverriderrigorringerriserriverroarrobberrockerrollerrooferroosterrosterrubberrulerrumorrunner
Math words that start with o are operation, order, octagon,ordinary,and more to come!
Non-removable discontinuity, nonagon, and nonexistent answer are just a few math words that start with non.
Words that start with G and end in R are:gamblergangstergardenergeargendergeneratorghostwritergingerglacierglaziergliderglimmergoitergold-diggergolfergoobergoofiergophergossamergrandeurgranulargrasshoppergrazerguitargutter
Words that start with R and end with N are:raccoonrainradonranrationravenreasonrecessionreckonreflectionrefrainrefrigerationreinremainreunionribbonriboflavinripenroanrobinRomanrottenruffianruinrun
Some math words beginning with the letter E are:EqualsEquationEquilateralEvaluateExpandExpression
vector
Zero (:
-arithmetic-algebra-angle
Geometry
hypotenuse