resembling

 examples-

anthropoid:  resembling early man                                   Caucasoid:  resembling a Caucasian
 Mongoloid:  resembling a division of humans original to Asia

many

examples-

polysyllable:  having many syllables         

 having to do with

examples-

         psychic:  having to do with the mind
         biotic:  having to do with life       
         biologic:  having to do with the study of life
         alcoholic:  having to do with alcohol

person who is or has

Examples-

~Note: in some cases, addicted to

psychotic:  a person who has a mental disorder
alcoholic:  a person who is addicted to alcohol             psychic:  a person who can foretell the future

expert in the study of

Examples-

geologist:  an expert in the study of the earth
 musicologist:  an expert in the study of music

device which measures

Examples-

speedometer:  a device which measures speed
drunkometer:  a device which measures how drunk a person is

former

Examples-

~Note:  use a hyphen after "ex"
        ex-teacher                    ex-partner
        ex-singer                       ex-school