You can suggest a new alias, but they must be approved by an administrator before they are activated.
An example of how to use this: (Neon_Genesis_Evangelion is the tag and Evangelion is the alias. Evangelion -> Neon_Genesis_Evangelion)


Alias To Reason
bunny (15217) rabbit (6784) same thing
eyes_closed (103556) closed_eyes (290392)
cyan_hair (262) aqua_hair (68328) Same thing, really
turquoise_hair (9) aqua_hair (68328)
ichigo_(k-on!) (0) wakaouji_ichigo (142) full character name
tewi (5) inaba_tewi (10268) Combine the tags
race_queen (2892) racequeen (0) removing the space
tagme_(artist) (292) artist_request (59850)
katekyo_hitman_reborn! (1149) katekyo_hitman_reborn (852)
tie (1006) necktie (253663)
kyuubee (1312) kyubey (7004)
sakuraba_milfeulle (1) milfeulle_sakuraba (469) The second is much more used.
defoko (2) utane_uta (316) fan nickname to official name
willaim (0) petticoat (10603) I love it.
cop (0) police (4981)
xmas (3) christmas (20813)
boobies (2) breasts (924152)
boobs (37) breasts (924152)
bunny_ears (21584) rabbit_ears (24959)
yamiko (122) yamiya (71) http://www.pixiv.net/member.php?id=176223 artist's pixiv is やみや
big_boobies (0) big_breasts (240)
big_boobs (2) big_breasts (240)
lord_genome (12) lordgenome (176) Lordgenome is the official translation but alot of fans use Lord Genome
tengen_toppa_gurren-lagann (613) tengen_toppa_gurren_lagann (7112) Official spelling is gurren_lagann
blond_hair (280) blonde_hair (823745)
love_is_war (3) koi_wa_sensou_(vocaloid) (622) English name to Japanese name
cosmo_p (0) cosmo_(bousoup) (43) Artist's full username
spiked_hair (36795) spiky_hair (1360)
cloud (158424) clouds (3494) plural (many clounds on a picture)
moero!_justice_gakuen (78) project_justice (10) Japanese to English title
shiritsu_justice_gakuen (132) rival_schools:_united_by_fate (8) Japanese to English title
kemonomimi (295) animal_ears (482273) Japanese and English synonyms.
protoman (0) blues_(rockman) (105) US name=JPN name
toono_akiha (774) tohno_akiha (552)
blushing (109) blush (1154460) The same thing, and blush is more common.
griffin (258) griffin (258)
soryu_asuka_langley (2771) souryuu_asuka_langley (8068)
ultimate_madoka (3601) goddess_madoka (813) same thing, latter is more popular
gryphon (8) griffin (258)
donut (50) doughnut (7363)
horo (87) holo (1773) official spelling
megaman (32) rockman (4892) USA ver.--->Jpn ver.
megaman_(series) (0) rockman_(series) (1) USA ver. --> Jpn ver.
fatal_frame_iv (0) fatal_frame_4 (224) Roman Numerals
female_protagonist_(pokemon_bw2) (262) mei_(pokemon) (2245) Official name given to the female protagonist in Pokémon Black 2 and White 2.
male_protagonist_(pokemon_bw2) (132) kyouhei_(pokemon) (549) Official name given to the male protagonist in Pokémon Black 2 and White 2.
double_buns (357) double_bun (60151) Same concept, one just has the plural.
laugh (122) laughing (8637) Same thing
hayate_no_gotoku (1) hayate_no_gotoku! (2501) …
alicia_satsuki_mclean (0) alicia_satsuki_mcclane (1)