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amplitude : the maximum displacement of the energy from it's mean value is called amplitude .unit is meter. 
pitch : pitch is a non-measurable quantity, having a relative character ,  more the frequency more the pitch and vice-versa
frequency : number of oscillation per seconds is called frequency .unit of frequency is Hertz i.e. Hz
time period : time taken to complete one oscillation is called time period. unit is seconds.
echo : a sound caused by the reflection of sound waves from a surface back to the listener is called an echo
oscillation : oscillation is also defined as wavelength i.e. the distance between 2 successive/ compression/rarefaction/trough/crest is called as wavelength .unit is lamda.
i hope it helps...............
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