WordNet (r) 3.0 (2006):

in name only
    adv 1: by title or repute though not in fact; "he's a doctor in
           name only" [syn: in name, in name only]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "in name only":
   alleged, apparently, artificially, avowed, byname, claimed,
   cognominal, diminutive, epithetic, erroneously, factitiously,
   falsely, formal, honorific, hypocoristic, hypocritical, nominal,
   nominally, nominative, ostensible, ostensibly, plausibly,
   pretended, pretexted, professed, purported, quasi, seemingly,
   self-called, self-christened, self-styled, so-called, soi-disant,
   specious, spuriously, synthetically, titular, truthlessly,
   ungenuinely, unnaturally, untruly, unveraciously, would-be