for(Schema.SobjectField strFld: Account.SobjectType.getDescribe().fields.getMap().Values()){
Schema.DescribeFieldResult dfield = strFld.getDescribe();
if( dfield.getName()=='OwnerId'){
    system.debug('API Name='+dfield.getName()+ ' ,label= ' + dfield.getLabel());// API Name=OwnerId ,label= Owner ID
    system.debug('Relationshipname = '+ dField.getRelationshipName()); // Relationshipname = Owner
}