釘頭 is read as ていとう (teitou) and means nailhead.
ていとう
teitou
くぎ
nail
ねんとう
beginning of the year
せんとう
head (of a line, group, etc.)
がいとう
(on the) street
ひっとう
brush tip
(on one's) mind
ぼうとう
beginning
あたま
hair (on one's head)
ぼっとう
immersing oneself in
まがしら
inner canthus
はとう
wave crest
かいとう
society president